JP3798868B2 - Pipe fitting - Google Patents

Pipe fitting Download PDF

Info

Publication number
JP3798868B2
JP3798868B2 JP35672696A JP35672696A JP3798868B2 JP 3798868 B2 JP3798868 B2 JP 3798868B2 JP 35672696 A JP35672696 A JP 35672696A JP 35672696 A JP35672696 A JP 35672696A JP 3798868 B2 JP3798868 B2 JP 3798868B2
Authority
JP
Japan
Prior art keywords
bolt
pipe joint
circular portion
insertion hole
inclined surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP35672696A
Other languages
Japanese (ja)
Other versions
JPH10196859A (en
Inventor
操 久保田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Riken Corp
Original Assignee
Riken Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Riken Corp filed Critical Riken Corp
Priority to JP35672696A priority Critical patent/JP3798868B2/en
Publication of JPH10196859A publication Critical patent/JPH10196859A/en
Application granted granted Critical
Publication of JP3798868B2 publication Critical patent/JP3798868B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Joints With Sleeves (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、半割型の管継手部材の両側フランジをボルトとナットにより締着させて管を接続するタイプの管継手に関し、特に詳述すれば、ボルトの回り止めとして機能する断面非円形部を一部に有するボルトを管継手部材のフランジに穿けた断面非円形のボルト挿入孔に挿通させた状態でナットを締め付けることにより管を接続する管継手に関する。
【0002】
【従来の技術】
従来、ハウジング形管継手やフランジ形管継手など、管継手部材をボルトとナットとにより螺合緊締して連結させて管を接続するタイプの管継手が多用されている。この種の管継手においては、ボルトの一部に断面非円形部を設け、且つ該ボルトの非円形部が挿通される管継手部材のボルト挿通孔の部位にボルトの非円形部に対応する非円形部を設け、これにボルトの非円形部を挿通させて、ボルトにナットを螺合して締付ける際のボルトの共回りを防止しボルトとナットとの締結を容易にする手段としている。
【0003】
この種の管継手の例として、ハウジング形管継手を図9乃至図13に示す。管継手1は、分割面部分から径方向外方に延在し、互いに間隔をもって対向する対のフランジ部3、3を有する半割型の管継手部材としての対のハウジング2、2と、ハウジング2、2の内周側に配設されるパッキン4と、対向するフランジ3、3に設けられたボルト挿通孔5、5を貫通し、両フランジ3、3を締結させるボルト6およびナット7とから基本的に構成されている。
【0004】
ここでボルト6は、図11に示すように、先端部分にネジ部8を有し頭部9に近接する部分に大径部分10を有し、該大径部分10は相対向する側面を平坦面11とした断面非円形部12としてある。一方、ハウジング2、2のフランジ部3、3に形成されたボルト挿通穴5、5は、図12に示すように、ボルト6の非円形部12が挿通可能で且つ収容された非円形部12の回転を許容しない寸法形状の非円形孔(図では長孔5)として形成されている。
【0005】
管継手1による管の連結は、接続しようとする管13、13の端面を対向させ、両管端の間をまたいでパッキン4を被せ、該パッキン4の外周側から、管端部の近傍に設けられた環状溝14にハウジング2、2の側縁を係合させた状態でハウジング2、2を被せ、フランジ部3、3のボルト挿通孔にボルトを挿通しナット7で締め付けることによりなされ、この際、ボルト6の非円形部12をフランジ部のボルト挿入孔の非円形部55に位置させることで、ナット7のボルト6への締着の際のボルトの回り止めがなされる。
【0006】
前述した構成の管継手においては、ボルト6の非円形部12がフランジ部3、3のボルト挿通孔の非円形部55に挿入されない状態で、即ち、ボルト6の非円形部12とフランジ部3、3の非円形部55とがズレ角度をもって組付けられることによりボルト6の非円形部の先端面がフランジ部3、3の非円形部55の開口端面に当接した状態で、ナット7での締め付けがされる場合があり得る。図13は、このようにして締着された連結不良の状態を示し、図中、向かって右側の一方のボルト6はその非円形部12がフランジ部3のボルト挿通孔の非円形部55に挿入されず、ボルトの非円形部12の先端面がボルト挿通孔の開口端縁に当接した状態でナット7により締め付けられた連結不良の状態を示す。
【0007】
このような連結不良は、配管作業者の注意により防止し得るものであるが、見逃される場合もあり、見逃された場合において実際の使用に際して生じる振動や配管の伸縮等の原因で管継手にズレが生じて一方のボルト6がボルト挿通孔に対して相対的にズレ動き、ボルトの非円形部12がボルト挿通孔の非円形部55に合致する状態になると、一方のボルト6およびナット7による締結が緩んだ状態となり、連結管の抜け出しやパッキンのシ−ル不良等を生じさせ、管継手の機能が損なわれる。
【0008】
前述の難点を解消するための手段として、特開平8−28764号公報には、ボルトの非円形部より先の部分の長さを短くし、あるいは非円形部の長さを長くして、ボルトの非円形部がフランジ部のボルト挿通孔の非円形部に正しく挿入されていないときにはボルト先端部のネジ部が前方のフランジから突出せず、ナットの締め付けを不可能にする管継手が開示されているが、継手とボルトの不適切な組合せのときには、ボルトのネジ部がわずかにナットによる締め付けを可能にする程度にフランジより突出し、不完全なナット締め付け状態を作ることがあり、また、ボルトを過度に短くすることは、配管作業性の面でも不便を伴うことがある。
【0009】
【発明が解決しようとする課題】
それ故、本発明は、ボルトおよびナットにより管継手部材を締結させる構成の管継手において、ボルトの非円形部が管継手部材のボルト挿通孔の非円形部に容易に且つ確実に挿入され、前述の連結不良の発生を防止し得る管継手を提供することを目的とする。
【0010】
【課題を解決するための手段】
本発明は、該目的を達成するために、請求項1の発明では、ボルト頭部に近接した位置に径外方に突出する部分を備えた非円形部を有するボルトと、該ボルトの非円形部を収容し該ボルトの回り止めをする非円形部を有するボルト挿通孔を備えた半割型の管継手部材と、該ボルトに螺合されるナットを有する管継手において、該ボルト挿通孔の非円形部の開口端周囲を螺旋状の傾斜面にしたことを特徴とする管継手を提供する。
更に、本発明の請求項2においては、前記請求項1の管継手において、前記管継手部材のボルト挿通孔の非円形部の開口端周囲の螺旋状の傾斜面の傾斜角を、ボルト挿通孔の中心軸に垂直な面に対して、20°〜60°の範囲内の傾斜角とした管継手を提供する
更に、請求項3では、前記請求項1または2に記載の管継手において、前記管継手部材の非円形部の開口端周囲の螺旋状の傾斜面が、該ボルトのネジの傾斜方向とは逆方向に傾斜している管継手を提供する。
更に、請求項4では、前記請求項1、2又は3に記載のいずれかの管継手において、管継手部材のボルト挿通孔の開口端縁に段部をもって径を拡大した切欠き部分が設けられている管継手を提供する。
更に、請求項5では、前記請求項1〜4のいずれかに記載の管継手において、ボルトの非円形部の先端面に、ボルト挿通孔の非円形部の開口端周囲の螺旋状の傾斜面と略平行な螺旋状の傾斜面を形成した管継手を提供する。
【0011】
本発明の管継手は、管継手部材のボルト挿通孔の非円形部の開口端周囲が螺旋状の傾斜面としてあるので、管継手の装着時にボルトの非円形部の先端部がこの螺旋状の傾斜面に当接し、該傾斜面に沿って滑ってズレ動き、ボルトが回転することによりボルトの非円形部とボルト挿通孔の非円形部とが合致して、ボルト挿通孔の非円形部へのボルトの非円形部の挿通が容易に確実になされ、ナットによる締め付けで正常な状態で装着される。したがって、従来のこの種の管継手における前記従来技術にみられる連結不良の発生が防止される。
【0012】
ここで、前記螺旋状の傾斜面の傾斜角が過度に小さいとボルトを回転させる効果が得られず、また、過度に大きくするとフランジ部の厚さとの関係で傾斜面の周方向長さが過度に短くなり、目的とする効果が得られない。本発明で好ましい角度範囲は、ボルト挿通孔の軸心に垂直な面から測定して20°〜60°の範囲である。
【0013】
更に本発明では、管継手部材のボルト挿通孔の非円形部の開口端周囲の螺旋状の傾斜面を、ボルトのネジとは逆向きに傾斜させているので、ボルトをナットで締め付ける場合に生じる偶力により、ボルトの非円形部の先端部が螺旋状の傾斜面に沿って滑り易くされ、従ってボルトの非円形部とボルト挿通孔の非円形部との合致がより容易になされるので、前記の連結不良の発生がより効果的に防止される。
【0014】
管継手部材のボルト挿通孔にボルトが垂直に挿入されない場合等において、ボルトが容易に回転し得ない状態で装着されることがあり得るが、前記いずれかの管継手において、管継手部材のボルト挿通孔の開口端縁に段部をもって径を拡大した切欠き部を設けることで、ボルトの非円形部の先端部と螺旋状の傾斜面との対接が良好に得られ、前記の連結不良の発生がより効果的に防止される。
【0015】
また、本発明で、ボルトの非円形部の先端面に、ボルト挿通孔の非円形部の開口端周囲の螺旋状の傾斜面と略平行な傾斜面を設けることにより、ボルトの非円形部の先端部が螺旋状の傾斜面に沿ってより滑り易くされるので、前記の連結不良の発生が更に効果的に防止される。
【0016】
【発明の実施の形態】
図1は、本発明の1実施例として、ハウジング形管継手のハウジング(片方のみを示す)を示す。なお、半割型の管継手の管継手部材としてのこのハウジング22は、2個一対として組み合わされ図10におけると同様にパッキン4を介して接続管端部に配設されボルトにより締結され両管端を連結する。
【0017】
ハウジング22は、そのフランジ部3にボルト挿通孔5を有す。このボルト挿通孔5は、図2および図3の(a)、(b)に示すように、ボルト6の非円形部12(図4参照)の最大回転半径よりもやや大きい半径の円形部と、この円形部に対して段を介して形成される非円形部(本例では長孔)55を有し、その長孔55の開口端周囲の段を螺旋状の傾斜面50とさせる。
【0018】
図4に、前記ボルト挿通孔5に挿入されるボルト6を示す。ボルト6はその先端部分にネジ部8を有し頭部9の近傍部分に径方向に拡大部を有する非円形部12を有す。ここで該非円形部12は、ボルト軸部の径よりも大きい径を有する円柱部の相対する側面を平坦にした略楕円形の断面形状をなし、前記ハウジングのボルト挿通孔5の非円形部(本例では長孔)55に挿通可能で且つ挿通状態でボルトの平坦な側面をボルト挿通孔5の短い方の径の面に合わせボルトの回転が防止される大きさ及び形状とされる。
【0019】
また、ボルト挿通孔5の非円形部(本例では長孔)55の開口端周囲の螺旋状傾斜面50は、ボルトの非円形部12の最大回転半径よりもやや大きい半径の円形領域に亘って向かい合う形に設けられている。
【0020】
前述のハウジング22を接続管の管端部間をまたぐようにパッキンを介して両管端部間に取付け、ボルト挿通孔5にボルト6を挿入すると、ボルト6の非円形部12の先端面は該ボルト挿通孔5の非円形部55の開口端周囲の前記螺旋状傾斜面50に当接し、該傾斜面に沿ってズレ動き、ボルト6の非円形部12の平坦面がボルト挿通孔の非円形部55の短い方の径の面に合致して、ナット7による締め付けにより正常な状態で管の連結がなされる。
【0021】
ここで、前記螺旋状傾斜面50を、好ましくはボルト6のネジの傾斜とは逆向きに傾斜させる。このことは、ナット7での締め付けの際にボルト非円形部12を該傾斜面50に沿ってズレ動き易くし、ボルト6の非円形部12をボルト挿通孔の非円形部55に容易に挿入させる上で有効である。
【0022】
また、好ましくは図6及び図7の(a)、(b)に示すように、ボルト挿通孔5の非円形部55の開口端面の前記螺旋状傾斜面50を形成する側壁の開放端部分に切欠き部52を設ける。この切欠き部52は、ボルト6がボルト挿通孔5に垂直に挿入されない場合などにおいて、ボルト6の非円形部がボルト挿通孔5の開放端部と干渉するのを防止し、ボルト6をボルト挿通孔5に垂直に位置させボルト6の正常な装着を容易にする上で有効である。
【0023】
また、図8に示すように、好ましくはボルト6の非円形部12の先端面をボルト挿通孔5の非円形部55の開口端周囲の前記螺旋状傾斜面50と略平行な傾斜面56とする。このようにボルトの非円形部の先端面に螺旋状の傾斜面56を設けることにより、ボルトの装着時に前記両傾斜面同士が対接し、その間でズレ動き易くなり、ボルト挿通孔の非円形部55へのボルトの非円形部12の装着がより容易になされる。
【0024】
【発明の効果】
以上の通りで、本発明の、管継手部材をボルトとナットにより締着させて管を接続する管継手においては、装着時に、ボルトに設けられた非円形部が、継手部材に設けられたボルト挿通孔の非円形部の開口端周囲に設けられた螺旋状の傾斜面の存在により容易に案内されて、該ボルト挿通孔の非円形部に装着されるので、連結不良の発生が効果的に防止される。
【図面の簡単な説明】
【図1】 本発明の実施例の管継手のハウジング(管継手部材)を示す斜視図である。
【図2】 図1のハウジングのボルト挿通孔の部分を示す平面図である。
【図3】 (a)は図2のA−A断面を示す断面図であり、(b)は図2のB−B断面を示す断面図である。
【図4】 本発明の管継手に使用されるボルトを示す斜視図である。
【図5】 本発明の別の実施例の管継手のハウジングを示す斜視図である。
【図6】 図5のハウジングのボルト挿通孔の部分を示す平面図である。
【図7】 (a)は図6のC−C断面を示す断面図であり、(b)は図6のD−D断面を示す断面図である。
【図8】 本発明の実施例の管継手に使用されるボルトを示す斜視図である。
【図9】 従来のハウジング形管継手の装着状態を示す一部断面図である。
【図10】 図9のX−X断面を示す断面図である。
【図11】 従来のハウジング形管継手に使用されるボルトを示す斜視図である。
【図12】 従来のハウジング形管継手のハウジングの斜視図である。
【図13】 従来のハウジング形管継手の連結不良の状態を示す断面図である。
[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a pipe joint of a type in which pipes are connected by fastening both side flanges of a half-type pipe joint member with bolts and nuts. The present invention relates to a pipe joint for connecting pipes by tightening a nut in a state where a bolt having a part thereof is inserted into a bolt insertion hole having a non-circular cross section formed in a flange of a pipe joint member.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, pipe-type joints such as housing-type pipe joints and flange-type pipe joints in which pipe joint members are connected by screwing and tightening with bolts and nuts are widely used. In this type of pipe joint, a non-circular section is provided in a part of the bolt, and the bolt insertion hole portion of the pipe joint member through which the non-circular part of the bolt is inserted corresponds to the non-circular part of the bolt. A circular portion is provided, and a non-circular portion of the bolt is inserted through the circular portion to prevent the bolt from rotating together when the nut is screwed into the bolt and tightened, thereby facilitating the fastening between the bolt and the nut.
[0003]
As an example of this type of pipe joint, a housing type pipe joint is shown in FIGS. The pipe joint 1 includes a pair of housings 2, 2 as a half-type pipe joint member having a pair of flange portions 3, 3 that extend radially outward from the split surface portion and face each other with a gap therebetween, 2, a packing 4 disposed on the inner peripheral side of 2 and 2; a bolt 6 and a nut 7 that pass through bolt insertion holes 5 and 5 provided in opposing flanges 3 and 3 and fasten both flanges 3 and 3; It basically consists of
[0004]
Here, as shown in FIG. 11, the bolt 6 has a screw portion 8 at the tip portion and a large diameter portion 10 at a portion close to the head portion 9, and the large diameter portion 10 has flat side surfaces facing each other. A non-circular portion 12 having a cross-sectional surface 11 is formed. On the other hand, the bolt insertion holes 5 and 5 formed in the flange portions 3 and 3 of the housings 2 and 2 have non-circular portions 12 in which the non-circular portions 12 of the bolts 6 can be inserted and accommodated, as shown in FIG. Is formed as a non-circular hole (long hole 5 in the figure) having a dimension and shape that does not allow rotation.
[0005]
The pipes are connected by the pipe joint 1 so that the end faces of the pipes 13 and 13 to be connected face each other, and the packing 4 is covered between both pipe ends, and from the outer peripheral side of the packing 4 to the vicinity of the pipe end. Covering the housings 2 and 2 with the side edges of the housings 2 and 2 engaged with the annular grooves 14 provided, inserting bolts into the bolt insertion holes of the flange portions 3 and 3, and tightening with the nuts 7, At this time, the non-circular portion 12 of the bolt 6 is positioned in the non-circular portion 55 of the bolt insertion hole of the flange portion, thereby preventing the bolt from rotating when the nut 7 is fastened to the bolt 6.
[0006]
In the pipe joint having the above-described configuration, the non-circular portion 12 of the bolt 6 is not inserted into the non-circular portion 55 of the bolt insertion hole of the flange portions 3 and 3, that is, the non-circular portion 12 and the flange portion 3 of the bolt 6. 3 and the non-circular portion 55 of the bolt 6 are assembled with a deviation angle so that the end surface of the non-circular portion of the bolt 6 is in contact with the open end surface of the non-circular portion 55 of the flange portions 3 and 3. May be tightened. FIG. 13 shows a state of poor connection fastened in this manner. In the drawing, the right-hand bolt 6 has a non-circular portion 12 at the non-circular portion 55 of the bolt insertion hole of the flange portion 3. A state of poor connection that is not inserted and is tightened by the nut 7 in a state where the front end surface of the non-circular portion 12 of the bolt is in contact with the opening edge of the bolt insertion hole is shown.
[0007]
Such poor connections can be prevented by the attention of the piping operator, but may be overlooked, and if this is overlooked, the pipe joint may be displaced due to vibrations or expansion / contraction of the piping that occur during actual use. When one bolt 6 moves relative to the bolt insertion hole and the non-circular portion 12 of the bolt matches the non-circular portion 55 of the bolt insertion hole, the one bolt 6 and the nut 7 The fastening is loosened, the connecting pipe is pulled out, the seal of the packing is defective, and the function of the pipe joint is impaired.
[0008]
As a means for solving the above-mentioned problems, Japanese Patent Application Laid-Open No. 8-28764 discloses that the length of the part ahead of the non-circular part of the bolt is shortened or the length of the non-circular part is lengthened. When the non-circular portion of the bolt is not correctly inserted into the non-circular portion of the bolt insertion hole of the flange portion, the threaded portion of the bolt tip portion does not protrude from the front flange, and a pipe joint is disclosed that makes it impossible to tighten the nut. However, when the joint and bolt are improperly combined, the bolt thread may protrude slightly from the flange to allow tightening with a nut, creating an incomplete nut tightening condition. It may be inconvenient in terms of workability of piping to make the length too short.
[0009]
[Problems to be solved by the invention]
Therefore, according to the present invention, in the pipe joint configured to fasten the pipe joint member with the bolt and the nut, the non-circular part of the bolt is easily and reliably inserted into the non-circular part of the bolt insertion hole of the pipe joint member. It aims at providing the pipe joint which can prevent generation | occurrence | production of poor connection.
[0010]
[Means for Solving the Problems]
To achieve the above object, according to the present invention, a bolt having a non-circular portion having a portion projecting radially outward at a position close to a bolt head and a non-circular shape of the bolt is provided. In a pipe joint member having a bolt insertion hole having a bolt insertion hole having a non-circular portion that accommodates a portion and prevents rotation of the bolt, and a pipe joint having a nut screwed into the bolt, the bolt insertion hole Provided is a pipe joint characterized in that a periphery of an opening end of a non-circular portion is formed into a spiral inclined surface.
Further, according to a second aspect of the present invention, in the pipe joint of the first aspect, the inclination angle of the helical inclined surface around the opening end of the non-circular portion of the bolt insertion hole of the pipe joint member is defined as the bolt insertion hole. The pipe joint according to claim 1 or 2, further comprising a pipe joint having an inclination angle within a range of 20 ° to 60 ° with respect to a plane perpendicular to the central axis of the pipe. Provided is a pipe joint in which a spiral inclined surface around the opening end of a non-circular portion of the pipe joint member is inclined in a direction opposite to the inclination direction of the screw of the bolt.
Further, according to a fourth aspect of the present invention, in the pipe joint according to any one of the first, second, and third aspects, a notch portion having a stepped portion and an enlarged diameter is provided at the opening edge of the bolt insertion hole of the pipe joint member. Provide pipe fittings.
Furthermore, in Claim 5, in the pipe joint according to any one of Claims 1 to 4, a spiral inclined surface around the opening end of the non-circular portion of the bolt insertion hole is formed on the tip surface of the non-circular portion of the bolt. And a pipe joint having a spiral inclined surface substantially parallel to the surface.
[0011]
In the pipe joint of the present invention, since the periphery of the opening end of the non-circular part of the bolt insertion hole of the pipe joint member is a spiral inclined surface, the tip part of the non-circular part of the bolt is attached to the helical part when the pipe joint is mounted. Abutting on the inclined surface, sliding along the inclined surface, moving and shifting, and when the bolt rotates, the non-circular portion of the bolt and the non-circular portion of the bolt insertion hole are matched to the non-circular portion of the bolt insertion hole. The non-circular portion of the bolt can be inserted easily and securely, and it is mounted in a normal state by tightening with a nut. Therefore, it is possible to prevent the occurrence of poor connection in the conventional pipe joint of this type as seen in the prior art.
[0012]
Here, if the inclination angle of the spiral inclined surface is excessively small, the effect of rotating the bolt cannot be obtained, and if excessively large, the circumferential length of the inclined surface is excessive in relation to the thickness of the flange portion. The desired effect cannot be obtained. A preferable angle range in the present invention is a range of 20 ° to 60 ° as measured from a plane perpendicular to the axis of the bolt insertion hole.
[0013]
Furthermore, in the present invention, since the spiral inclined surface around the opening end of the non-circular portion of the bolt insertion hole of the pipe joint member is inclined in the direction opposite to the screw of the bolt, it occurs when the bolt is tightened with a nut. Due to the couple, the tip of the non-circular portion of the bolt is made slippery along the spiral inclined surface, so that the non-circular portion of the bolt and the non-circular portion of the bolt insertion hole are more easily matched. The occurrence of the connection failure is more effectively prevented.
[0014]
In the case where the bolt is not inserted vertically into the bolt insertion hole of the pipe joint member, etc., the bolt may be mounted in a state where it cannot be easily rotated. By providing a notch with an enlarged diameter at the opening edge of the insertion hole with a stepped portion, the tip of the non-circular portion of the bolt and the spiral inclined surface can be satisfactorily obtained, and the above-mentioned poor connection Is more effectively prevented.
[0015]
Further, in the present invention, by providing an inclined surface substantially parallel to the spiral inclined surface around the opening end of the non-circular portion of the bolt insertion hole on the tip surface of the non-circular portion of the bolt, the non-circular portion of the bolt is provided. Since the tip portion is made more slippery along the spiral inclined surface, the occurrence of the poor connection is further effectively prevented.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a housing (only one side is shown) of a housing type pipe joint as one embodiment of the present invention. In addition, this housing 22 as a pipe joint member of a half-type pipe joint is combined as a pair and disposed at the end of the connecting pipe via the packing 4 as in FIG. Connect the ends.
[0017]
The housing 22 has a bolt insertion hole 5 in its flange portion 3. As shown in FIGS. 2 and 3 (a) and (b), the bolt insertion hole 5 includes a circular portion having a radius slightly larger than the maximum rotation radius of the non-circular portion 12 (see FIG. 4) of the bolt 6. The circular portion has a non-circular portion (long hole in this example) 55 formed through a step, and the step around the open end of the long hole 55 is a spiral inclined surface 50.
[0018]
FIG. 4 shows the bolt 6 inserted into the bolt insertion hole 5. The bolt 6 has a non-circular portion 12 having a screw portion 8 at the tip portion and a radially expanding portion in the vicinity of the head portion 9. Here, the non-circular portion 12 has a substantially oval cross-sectional shape in which the opposite side surfaces of the cylindrical portion having a diameter larger than the diameter of the bolt shaft portion are flattened, and the non-circular portion of the bolt insertion hole 5 of the housing ( In this example, the bolt can be inserted into the long hole 55 and the flat side surface of the bolt in the inserted state is aligned with the shorter diameter surface of the bolt insertion hole 5 so that the bolt is prevented from rotating.
[0019]
Further, the spiral inclined surface 50 around the opening end of the noncircular portion (long hole in this example) 55 of the bolt insertion hole 5 extends over a circular region having a radius slightly larger than the maximum rotation radius of the noncircular portion 12 of the bolt. It is provided to face each other.
[0020]
When the housing 22 is attached between both pipe ends via packing so as to straddle between the pipe ends of the connecting pipe, and the bolt 6 is inserted into the bolt insertion hole 5, the tip surface of the non-circular portion 12 of the bolt 6 is Abutting on the spiral inclined surface 50 around the opening end of the non-circular portion 55 of the bolt insertion hole 5 and moving along the inclined surface, the flat surface of the non-circular portion 12 of the bolt 6 is not covered by the bolt insertion hole. The pipes are connected in a normal state by tightening with the nut 7 in conformity with the shorter diameter surface of the circular portion 55.
[0021]
Here, the spiral inclined surface 50 is preferably inclined in the direction opposite to the inclination of the screw of the bolt 6. This makes it easy for the bolt non-circular portion 12 to move along the inclined surface 50 when tightening with the nut 7, and the non-circular portion 12 of the bolt 6 is easily inserted into the non-circular portion 55 of the bolt insertion hole. It is effective in making it happen.
[0022]
Preferably, as shown in FIGS. 6 and 7 (a) and (b), at the open end portion of the side wall forming the spiral inclined surface 50 of the open end surface of the non-circular portion 55 of the bolt insertion hole 5. A notch 52 is provided. The notch 52 prevents the non-circular portion of the bolt 6 from interfering with the open end of the bolt insertion hole 5 when the bolt 6 is not inserted perpendicularly into the bolt insertion hole 5. It is effective in facilitating normal mounting of the bolt 6 by being positioned perpendicular to the insertion hole 5.
[0023]
Further, as shown in FIG. 8, preferably, the tip surface of the non-circular portion 12 of the bolt 6 has an inclined surface 56 substantially parallel to the spiral inclined surface 50 around the opening end of the non-circular portion 55 of the bolt insertion hole 5. To do. Thus, by providing the spiral inclined surface 56 on the tip surface of the non-circular portion of the bolt, both the inclined surfaces come into contact with each other when the bolt is attached, and it becomes easy to move between them, and the non-circular portion of the bolt insertion hole Mounting of the non-circular portion 12 of the bolt to 55 is made easier.
[0024]
【The invention's effect】
As described above, in the pipe joint of the present invention in which the pipe joint member is fastened with the bolt and the nut to connect the pipe, the non-circular portion provided in the bolt is attached to the bolt at the time of mounting. Since it is easily guided by the presence of the spiral inclined surface provided around the opening end of the non-circular portion of the insertion hole and is mounted on the non-circular portion of the bolt insertion hole, the occurrence of poor connection is effective. Is prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a housing (pipe joint member) of a pipe joint according to an embodiment of the present invention.
2 is a plan view showing a bolt insertion hole portion of the housing of FIG. 1. FIG.
3A is a cross-sectional view showing the AA cross section of FIG. 2, and FIG. 3B is a cross-sectional view showing the BB cross section of FIG. 2;
FIG. 4 is a perspective view showing a bolt used in the pipe joint of the present invention.
FIG. 5 is a perspective view showing a housing of a pipe joint according to another embodiment of the present invention.
6 is a plan view showing a portion of a bolt insertion hole of the housing of FIG. 5. FIG.
7A is a cross-sectional view showing a CC cross section of FIG. 6, and FIG. 7B is a cross-sectional view showing a DD cross section of FIG. 6;
FIG. 8 is a perspective view showing a bolt used in the pipe joint according to the embodiment of the present invention.
FIG. 9 is a partial cross-sectional view showing a mounting state of a conventional housing type pipe joint.
10 is a cross-sectional view showing the XX cross section of FIG. 9. FIG.
FIG. 11 is a perspective view showing a bolt used in a conventional housing-type pipe joint.
FIG. 12 is a perspective view of a housing of a conventional housing type pipe joint.
FIG. 13 is a cross-sectional view showing a poorly connected state of a conventional housing-type pipe joint.

Claims (5)

ボルトおよびナットにより対の管継手部材を締着させて接続されようとする管を連結する管継手において、頭部に近接した位置に径外方に突出する部分を含む非円形部を有するボルトと、該ボルトの非円形部を収容し該ボルトの回り止めをする非円形部を有するボルト挿通孔を備えた管継手部材と、該ボルトに螺合されるナットとを有し、該ボルト挿通孔の非円形部の開口端周囲に螺旋状の傾斜面が設けられていることを特徴とする管継手。A pipe joint for connecting a pipe to be connected by fastening a pair of pipe joint members with a bolt and a nut, and a bolt having a non-circular portion including a portion protruding radially outward at a position close to the head A pipe joint member having a bolt insertion hole having a non-circular portion for receiving the non-circular portion of the bolt and preventing rotation of the bolt, and a nut screwed into the bolt, the bolt insertion hole A pipe joint characterized in that a spiral inclined surface is provided around the opening end of the non-circular portion. 前記螺旋状の傾斜面の傾斜角が20°〜60°の範囲にある請求項1に記載の管継手。The pipe joint according to claim 1, wherein an inclination angle of the spiral inclined surface is in a range of 20 ° to 60 °. 前記管継手部材のボルト挿通孔の非円形部の開口端周囲に螺旋状の傾斜面が、前記ボルトのネジの傾斜方向とは逆方向に傾斜している請求項1または2に記載の管継手。The pipe joint according to claim 1 or 2, wherein a spiral inclined surface is inclined in a direction opposite to an inclination direction of a screw of the bolt around an opening end of a non-circular portion of the bolt insertion hole of the pipe joint member. . 前記管継手部材のボルト挿通孔の開口端縁に段部をもって径を拡大した切欠き部が設けられている請求項1〜3のいずれかに記載の管継手。The pipe joint in any one of Claims 1-3 in which the notch part which expanded the diameter with the step part is provided in the opening edge of the bolt insertion hole of the said pipe joint member. 前記ボルトの非円形部の先端面に、ボルト挿通孔の非円形部の開口端周囲の螺旋状の傾斜面に略平行な傾斜面を設けた請求項1〜4のいずれかに記載の管継手。The pipe joint according to any one of claims 1 to 4, wherein an inclined surface substantially parallel to a spiral inclined surface around the opening end of the non-circular portion of the bolt insertion hole is provided on a tip surface of the non-circular portion of the bolt. .
JP35672696A 1996-12-27 1996-12-27 Pipe fitting Expired - Fee Related JP3798868B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP35672696A JP3798868B2 (en) 1996-12-27 1996-12-27 Pipe fitting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP35672696A JP3798868B2 (en) 1996-12-27 1996-12-27 Pipe fitting

Publications (2)

Publication Number Publication Date
JPH10196859A JPH10196859A (en) 1998-07-31
JP3798868B2 true JP3798868B2 (en) 2006-07-19

Family

ID=18450472

Family Applications (1)

Application Number Title Priority Date Filing Date
JP35672696A Expired - Fee Related JP3798868B2 (en) 1996-12-27 1996-12-27 Pipe fitting

Country Status (1)

Country Link
JP (1) JP3798868B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000257767A (en) * 1999-03-09 2000-09-19 Taiyoo Joint Kk Joint for pipe
JP5953586B2 (en) * 2014-04-11 2016-07-20 株式会社トヨックス Pipe fitting

Also Published As

Publication number Publication date
JPH10196859A (en) 1998-07-31

Similar Documents

Publication Publication Date Title
JP3798868B2 (en) Pipe fitting
US4664425A (en) Pipe-flange coupling with irreversible screwing at rotation
JPH02163592A (en) Pipe joint
JPH11141764A (en) Split pipe joint
KR100429037B1 (en) Coffin joint
JPH08178163A (en) Header
JP3609468B2 (en) Pipe fitting
JP3924459B2 (en) Pipe fitting
JPH11218274A (en) Housing shaped pipe joint
JPH045832Y2 (en)
JP2573880Y2 (en) Victory type pipe fittings
JPH07272573A (en) Installation method of corona ring for polymer insulator and installation structure and corona ring
JPS5813180Y2 (en) Valve with expansion joint
JP7481013B2 (en) Pipe Fittings
JPH10176706A (en) Bolt for divided tube joint
JP2576560Y2 (en) Corrugated pipe joint connection structure
JPH0533890A (en) Pipe joint
JPH0410471Y2 (en)
JP2655132B2 (en) Support for cylindrical members
KR200184216Y1 (en) Coupling for jointing a nonferrous matals tube
JP3115192B2 (en) Method for forming insertion projection and detachable pipe joint having the insertion opening
JP2949334B2 (en) Pipe detachment prevention fitting for union nut joint
JP2671776B2 (en) Butterfly valve fittings
JPH021585Y2 (en)
JPH0419227Y2 (en)

Legal Events

Date Code Title Description
RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20050920

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20060308

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20060316

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20060421

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090428

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120428

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120428

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150428

Year of fee payment: 9

LAPS Cancellation because of no payment of annual fees